Research On Temperature Distribution In The Smelting Furnace Of Scrap Copper

Smelting furnace is a new type of copper scrap smelting equipment on the basis of reverberatory furnace. The temperature distribution of smelting furnace is a key factor for normal operation of scrap copper production in the process production. In this paper, the temperature distribution in smelting furnace is deeply analyzed by the CFD simulation of scrap copper metallurgical process. In process production, how to measure the influence of each input-condition of smelting furnace on the distribution of temperature is an important problem. A concept named POD angle is proposed for measuring the extent of state changes in a distribution system. The POD angle can evaluate temperature distribution changes inside the furnace, which measures the degree of impaction for each factor imposed on the temperature distribution of smelting furnace. Combined with the average change of temperature in the furnace, the selecting principles of the operating-point of smelting furnace are designed on the basis of POD angle. Furthermore, reconstruction of temperature inside the smelting furnace has been done by the Snapshots method. The main results and contributions of this dissertation are as follows.(1) A CFD based simulation model of scrap copper smelting furnace is designed and the analysis of scrap copper production is carried out. The results show that the temperature inside the smelting furnace has obvious characteristic of distributed parameter system. High temperature zones distributed at bottom of the shaft furnace and the lower part of the furnace. The distribution of temperature in the shaft shows a trend of reduction with the move of fume. It can be shown from the simulation that the furnace possesses a good thermal efficiency.(2) A concept of POD angle is put forward, as an indicator of distributed parameter system changes. Various mathematic properties of POD angle are summarized and proven, and the calculation algorithm for POD angle is also designed. The influences of various factors on the temperature inside the smelting furnace are analyzed by proposed POD angle. Meanwhile, according to the changes of POD angle, a method for determining the number of experiments that is necessary to be performed on the property’s analysis of system is also proposed.(3) Based on the CFD simulation model of smelting furnace and the concept of POD angle, the impact of inlet-pressures of furnace burner and the induction air imposing on the temperature distribution inside the furnace are analyzed. A principle of determining operating-point is ascertained, which is used for determining the operating-point of the furnace. Combining the CFD simulation results and the characteristics of POD angle, the temperature distribution at the operating-point is reconstructed by Snapshots method.Finally, the conclusions and challenges of future studies are given.